Bring a large pot of salted water to a boil and cook orzo according to package directions until al dente.
Drain and rinse the orzo under cold water. Allow it to cool completely.
In a large mixing bowl, combine cooled orzo, cucumber, cherry tomatoes, red onion, parsley, and dill.
In a small bowl, whisk together olive oil, lemon juice, lemon zest, Dijon mustard, garlic, salt, and pepper.
Pour the dressing over the pasta mixture and toss until evenly coated.
Gently fold in the crumbled feta cheese.
Cover and refrigerate for at least 30 minutes before serving.
Toss lightly before serving and garnish with extra feta and fresh herbs if desired.